前后端分离 Web AP接口访问跨域问题

<system.webServer>
<httpProtocol>
<customHeaders>
<add name="Access-Control-Allow-Origin" value="*" />
<add name="Access-Control-Max-Age" value="30" />
<add name="Access-Control-Allow-Methods" value="GET,POST,OPTIONS" />
<add name="Access-Control-Allow-Headers" value="Content-Type,X-Requested-With,token,userId" />
<!--响应头 请按照自己需求添加 这里新加了token这个headers-->
<!--<add name="Access-Control-Allow-Headers" value="Content-Type,Accept" />-->
<add name="Access-Control-Request-Methods" value="GET, POST, PUT, DELETE, OPTIONS" />
</customHeaders>
</httpProtocol>

</system.webServer>